@ - @ ten ) as the angel of the north sculpture , which gradually develops a tightly ad ##hering oxide layer as it is exposed to the elements . this layer inhibit ##s further corrosion by reducing its per ##me ##ability to water . as part of the design , the spikes swayed slightly in the wind in order to withstand gust ##s in excess of 100 mph ( 160 km / h ) . at the time of construction a time capsule was placed in one of the spikes of the sculpture , containing children ' s poems and paintings , due to be opened circa 230 ##0 . the location of the time capsule after di ##sman ##tling is currently unknown . b of the
@ - @ ten ) as the angel of the north sculpture, which gradually develops a tightly adhering oxide layer as it is exposed to the elements. this layer inhibits further corrosion by reducing its permeability to water. as part of the design, the spikes swayed slightly in the wind in order to withstand gusts in excess of 100 mph ( 160 km / h ). at the time of construction a time capsule was placed in one of the spikes of the sculpture, containing children's poems and paintings, due to be opened circa 2300. the location of the time capsule after dismantling is currently unknown. b of the